Grinding-mill.



G. S. EMERIGK. GRINDING MILL. APPLICATION FILED 00T.18, 1907.

m 2 mm m m z a. w Mm 1 a MW 0% L 2 a i 3 a 0 Q l E 2 8 2 9 WITNESSES Gozy G. S. EMERIGK.

GRINDING MILL. APPLICATION FILED 00110. 1907.

Patented July 12, 1910.

2 SHEETSSHBET 2.

m/mvrm Geayc AS: Emerick WI T/VESSES an'r orb.

GEORGE STOCKHAM EMERICK, OF NAZARETI-I, PENNSYLVANIA.

GRINDING-MILL.

To all whom it may concern:

Be it known that I, Gnonon STooKHAM EMERIQK, citizen of the United States, residing at Nazareth, in the county of North ampton and State of Pennsylvania, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

The object of my invention is to provide a simple and efficient machine for grinding and screening coal, limestone, cement clinker, &'c., said machine having provision whereby access may be readily had to either the grinding or the screening mechanism, and

whereby the discharge of hard substances by centrifugal force from the grinding mechanism to the screen is obviated.

The invention consists in the novel construction and combinations of parts hereinafter fully described and claimed.

Figure 1 is a vertical section of a grinding and screening machine embodying my invention. Fig. 2 is a sectional plan view thereof, as on the line 22, of Fig. 1. Fig. 3 is a sectional plan view of the screening mechanism, as on the line 33, of Fig. 1.

4 designates a frame work, the upper portion of which supports a casting 5 having a circular depression 6 therein for the reception of the ground material. Resting upon the top of the casting 5 and surrounding the depression 6 therein, is a circular frame 7, provided with a cover 8. The casting 5, frame 7, and cover 8 are secured together by suitable bolts 9, and they inclose a chamber 10, in which the material is ground.

Supported in the lower portion of the frame work 4, is a bearing 11, in which is journaled the lower end of a central, vertically arranged shaft 12, provided with a driving pulley 13. The upper end of the shaft 12 extends into the chamber 10 and through a bearing 13 in the casing 5. Arranged within the chamber 10 and secured to the upper end of the shaft 12, is the hub of a circular, rotatable grinding member 14, provided with a horizontal portion 15, from which extends an upwardly and outwardly inclined portion 16. The inner face of the inclinedportion- 16 is provided with a hard metal .ring 17 forming a grinding surface.

Resting normally in contact with the grinding surface of the ring 17 is a series of grinding rollers 18 which are carried by outwardly and upwardly inclined shafts 19,

Specification of Letters Patent. Patented July 1L2, 11916.

Application filed October 18, 1907.

Serial No. 398,044.

the axes of which are parallel to the grinding face of the ring 1 The shafts 19 extend outwardly through openings 20 in the cover 8, and are supported in bearings 21. The npper ends of the shafts 19 are provided with grooves 22, into which extend rings 23, which are secured between the bearings 21 and caps 24 thereon. These rings 23, engaging the grooves 22, prevent longitudinal movement of the shafts 19.

Each bearing 21 is arranged between two "arms 25 which rise from the cover 8, and

each bearing 21 is provided with projecting pivot studs 26 which extend into openings in the arms 25, thus pivotally supporting the bearings 21, shafts 19, and rollers 18, in a manner to permit the rollers 18 to move toward and from the grinding surface of the ring 17, the openings 20 being large enough to permit such movement.

Pivotally connected to each bearlng 21 belowthe pivot stud 26, is the inner end of a rod 27 which extends outwardly through an opening in a'lug 28 projecting from the frame 7. The outer end of each rod 27 1s screw-threaded for the reception of the internally threaded hub of a hand wheel 29, between which and the lug 28 is interposed a spring 30, surrounding the rod- 27. The springs 30, bearing against the lugs 28 and the hubs of the hand wheels 29, tend to force the rods 27, and therewith the bearings 21, outwardly, and thus hold the rollers 18 yieldingly in contact with the grinding surface of the ring 17, from which they may be moved on the pivot studs 26 1n opposition to the springs 30. By adpustmg the hand wheels 29, the pressure of the rollers 18 against the ring 17 may be nicely regulated.

Supported upon the cover 7 and extending centrally therethrough, 1s a tube 13, the upper end of which is provided with a flaring or funnel-shaped inlet 32, into which the material to-be ground is introduced and from which it passes through the tube 31, and is deposited upon the grmdmg member 14.

Arranged below the chamber 10 and surrounding the shaft 12, is a circular screen 33, which is supported at its upper end by a flange depending from the casting 5. 0

The casting 5, or floor of the depression 6, is provided with openings 34 therein, to aiford communication between the chamber 10 and the interior of the screen 33, suitable Leading from one side of the screen 33 is a passageway or chute 37, throu h which the material deposited upon the flbor 36 is discharged from the screen. This passageway 37 may lead to a conveyer or any suitable opening or discharge. Secured to the shaft 12 above the floor 36, is a plate 39 carrying blades 40 which move the material upon the floor 36 to and discharge it through the passageway 37 Mounted upon the shaft 12 are collars 41, from which project fan blades 42 within ,the screen 33, the purpose of .which is to force theground material through the screen as it falls from the openings 34 during the rotation of the shaft 12.

Surrounding the screen 33 is a cylindrical casing 43 which is supported by a flange projecting from the casting 5 and providing a chamber 48 surroundin said screen; The bottom of the casirw 43 1s closed by a'fioor or plate 44, arranged below the floor 36, and leading from the floor 44 is a discharge pas-- sageway 45, which may lead to a conveyer or any suitable point. of discharge.

Secured to the shaft 12 between the fioors '36 and 44, is a plate 46' carrying blades 47 adapted to move the material deposited upon the floor 44 to the discharge passageway 45.

The operation may be briefly described as follows :-The material to be ground is introduced to the grinding member 14 through the tube 31, and ower is applied to the pulley 13 to rapid y rotate the shaft 12 and therewith the grinding member '14. The

' material to be ground passes from the hori- ,while the coarser zontal portion of the member 14 by centrifugal action to and between the grinding surface of the'ring 17, and the ing the rapid rotation of the'member 14 the rollers 18 are turned with or'upon the shafts 19 by contact with the ring 17 and the macrushin material has been ground, it passes by centrifugalforce over the top of the inclined portion 16 of the member 14, and falls by gravity into the depression 6, from which it is discharged through the openings 34, into the screen 33. As the ground material falls through the screen 33, it is blown by the blades 42 against the screen and the finer particles of the ground material pass through the screen into the chamber 48, particles fall upon the floor 36 and are, by the action of the blades 40, discharged through the passageway 37.

rollers 18. Dur- The finer particles, after passing through the screen 33 into the chamber 48, fall upon the floor 44, and are moved by the blades 47 to and passageway 45.

By the construction and operation hereinbefore described, it will be seen that the grinding mechanism cannot become choked for any cause whatsoever, for the reason, that the ground material may pass on through the openings 34 and passageway 37 to a point of discharge even when no material is passing through the screen 33, which sometimes happens due to the dampness of the material clogging the screen and due to other causes. Further, it will be seen that by the construction and arrangement of the parts no hard substances such as pieces of iron, 620., should they find their way into the rinding mechamsm, will be thrown there mm by centrifugal force against the screen 33 to injure the same, but will pass down throughthe openings 34, and being unaffected by the air from the fans 42, will fall upon the floor 36 and pass out through the'passageway 37. This arrangement, whereby the screen is thus protected, is an important feature of my invention.

I claim discharged through the.

the frame, walls forming a grindin chamber having a bottom, a substantially vertically-arranged circular screen below said chamber and communicating therewith, said screen having a floor portion closing the bottom thereof,'walls forming a passageway leading from the interior of the screen, a casing surroundin' the screen in spaced relation thereto, said casing having a floor portionclosing the bottom thereof, walls forming a passageway leadin from the interior of said casing, a centra 1y arranged shaft extending through the floor portion of the grinding chamber and into the grinding chamber and into the screen, a grinding member carried by said shaft within the grinding chamber, a second grinding member coacting with the first named grinding member, and means carried by said shaft .for causin the ground material to pass through said screen and into said casm 2. In a grin in mill, the combination of the frame, walls orming a grindin chamber having a bottom, a substantia ly vertically-arranged circular screen below said chamber and communicating therewith, said screen having a floor portion closing the bottom thereof, walls forming a passageway leading from the interior ofthe screen, a casing surrounding the screen in spaced relation thereto, portion closing the bottom thereof, walls forming a passageway leading from the insa1d casing having a floor terior of said casing, a centrally arranged shaft extending-through the, floor portion of the grinding chamber and into the grind ing chamber and into the screen, a grinding member carried by said shaft within the grinding chamber, a second grinding member waiting with the first named grinding member, means carried by said shaft for causing the ground material to pass through said screen and into said casing, means carried bysaid shaft for discharging material deposited upon the floor portion of the screen through the passageway leading from the interior of the screen, and means, carried by said shaft for discharging ma- 15 terial deposited upon the floor portion ofthe casing through the passageway leading from the interior of the casing.

In testimony whereof I aflix my signature in presence of two witnesses.

GEORGE STOCKHAM EMERICK. Witnesses:

A. V. GRoUPE, E; M. WARE. 

